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Heap overflow bug can potentionaly lead to alter heap in that way, that you can rule on its allocation / deallocation mechanism. Nowdays it is litle bit harder, because you need to fullfill some subset of prerequisities for choosen technique, and it is in more than less case not possible.

This post will describe how to break even LFH trough plugin, custom PoC for IE10 on win8 CP, vulnerable to winXP-8CP backend attack.